DHML | digital holography & microscopy laboratory

News


Dr. Kim present 2 DHML papers at SPIE Photonics West Conference 2014 in San Francisco, CA
 

 

"Study of self-interference incoherent digital holography for the application of retinal imaging".
"Parametric Studies of Adaptive Optics by Self-Interference Incoherent Digital Holography".

 

October 6-10, 2013: Jisoo, Xiao, Changgeng, and Dr. Kim present 3 papers and 1 poster at OSA FiO 2013 in Orlando, FL
 

 

Xiao presented her paper, "Four dimensional motility tracking of biological cells by digital holographic microscopy".
Changgeng presented his paper, "Image synthesis for off axis low coherence digital holography".
Jisoo presented his paper, "Unknown Arbitrary Phase Shift Retrieval and Holographic Reconstruction from Images Obtained from Self-Interference Incoherent Digital Holography".
Dr. Kim presented his paper, "Digital Holography of Natural Scenes".

 

June 1, 2013: Undergraduate student Andre' Spears joined DHML for summer REU program
 

 

REU oral presentation REU oral presentation


 

April 21-25, 2013: Jisoo, Xiao, and Dr. Kim present 2 papers and 1 poster at OSA DH 2013 in Kohala Coast, Hawaii
 

 

Group Photo with Chair Yoshikawa Group Photo with Chair Yoshikawa

Xiao presented her paper, "Four dimensional motility tracking of biological cells by digital holographic microscopy".
Changgeng presented his paper, "Simulation and Experiment of Fourier Transform Digital Holographic Adaptive Optics".
Jisoo presented his paper, "Resolution enhancement of incoherent digital holography using the super resolution image reconstruction technique".

 

October 14, 2012: Xiao, Changgeng, and Dr. Kim present 4 of DHML's papers at OSA FiO 2012 in Rochester, NY
 

 

Xiao presented her paper, "Quantitative imaging and measurement of cell-substrate surface deformation by digital holography".
Changgeng presented his paper, "In Vitro Bovine Retina Imaging by Digital Holographic Adaptive Optics".
Dr. Kim presented his paper, "Digital Holographic Adaptive Optics Techniques with Coherent or Incoherent Sources" and David's paper, "Noncontact single optical pulse method to measure cell membrane properties".

 

April 29 - May 2, 2012: David and Dr. Kim present 4 of DHML's papers at OSA DH 2012 in Miami, Fl
 

 

David and Dr. Kim present DHML papers:
"Quantitative imaging of surface deformation on substrata due to cell motility by digital holography",
"Time-dependent Surface Response of Fluid to Transmission Optical Pressure Impulse",
"A Proposal for Astronomical Adaptive Optics by Incoherent Digital Holography",
"Biological imaging by Digital Holographic Adaptive Optics".

 

Feb. 1, 2012: DHML Welcomes Lee and Jeong from Yonsei University
 

 

Group Photo with Lee and Jeong Graduate students Lee and Jeong from Yonsei University in Seoul, Korea begin a two week long visit to DHML to explore digital holography and collaborative research opportunities. Pictured here, the group enjoys a delicious sushi dinner before saying good-bye.


 

Oct. 16-20, 2011: Dr. Kim and David attend OSA FiO 2011 in San Jose, CA
 

 

Dr. Kim at FiO Dr. Kim is honored as a recent OSA Fellow while David presents his paper entitled "Time-dependent phase response of fluid interface to optical excitation" at OSA's 95th Annual Meeting, Frontiers in Optics in San Jose, CA.

 

Aug. 2011: DHML moves into the new Interdisciplinary Sciences building
 

 



 

Oct. 25, 2010: Dr. Kim is elected a Fellow of the Optical Society of America by the Board of Directors of OSA
 

 

Prof. Myung “Paul” Kim has been elected a Fellow of the Optical Society of America by the Board of Directors of OSA on October 25, 2010. Paul is recognized for his “pioneering work in digital holographic microscopy and development of its techniques and applications, such as digital interference holography and total internal reflection holographic microscopy”.

 

Oct. 08, 2008: Graduate and undergraduate research opportunities available.
 

 

Please contact Prof. Kim if you are interested.

 

Aug. 21, 2008: Nilanthi successfully defends her PhD dissertation.
 

 

    N. Warnasooriya, “Quantitative phase imaging microscopy with multi-wavelength optical phase unwrapping”

    This dissertation presents a quantitative phase imaging microscopy technique that combines phase-shifting interferometry with multi-wavelength optical phase unwrapping. The technique consists of a Michelson-type interferometer illuminated with any of three types of light sources; light emitting diodes, laser diodes and a ring dye laser. Interference images are obtained by using a 4-frame phase shifting method, and are combined to calculate the phase of the object surface. The 2π ambiguities are removed by repeating the experiment combining two and three different wavelengths, which yields phase images of effective wavelength much longer than the original. The resulting image is a profile of the object surface with a height resolution of several nanometers and range of several microns. To our knowledge, this is the first time that a three wavelength optical phase unwrapping method with no amplified phase noise has been presented for full frame phase images.
    The results presented here are divided into three main categories based on the source of illumination; light emitting diodes, laser diodes and a ring dye laser. Results for both two-wavelength optical unwrapping and three-wavelength optical unwrapping techniques are demonstrated.
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    The interferographic images using broadband sources such as light emitting diodes are significantly less affected by coherent noise compared to images obtained using lasers. Our results show that the three wavelength optical phase unwrapping can also be effectively applied to unwrap phase images obtained using coherent light sources such as lasers and laser diodes, without amplifying phase noise in the final phase image. We have successfully shown that our multi-wavelength phase-shifting technique extends the range free of 2π ambiguities in the phase map without using conventional computation intensive phase unwrapping methods. This phase imaging technique can be used to measure physical thickness or height of both biological and other microscopic samples, with nanometer axial resolution. An added advantage of the multi-wavelength optical phase unwrapping technique is that the beat wavelength can be tailored to match height variations of specific samples.

 

Sep. 12 , 2008: Alex successfully defends her PhD dissertation.
 

 

    A. Khmaladze , “Three-dimensional microscopy by laser scanning and multi-wavelength digital holography”

     

 

July 4-8 , 2008: Dr. Kim visits universities in Hyderabad, India, to present workshops on digital holography.
 

 

 

Nov. 23, 2007 : Picnic at Fort De Soto Park
 

 

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Jul. 19 , 2007 : Dr. Kim gives plenary address to Optical Society of Korea in Sokcho, Korea.
 

 

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Apr. 23-25 , 2007 : Digital holography workshop in Loughborough Univ., UK.
 

 

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Nov. 25, 2006 : Dinner!
 

 

 

Aug. 23, 2004: We have moved to a newly renovated lab!
 

 



 

May 14, 2004 : Dinner!
 

 

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May 4, 2004: At the campus kodak corner...
 

 

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Nov. 13, 2003 : Dan at OISE Meeting.
 

 

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